<!-- TRIGONAL P312 SPACE GROUPS -->
<input type="checkbox" name="spacegroups[]" id="sg_P312" value="P312"> P312<br/>
<input type="checkbox" name="spacegroups[]" id="sg_P3112" value="P3112"> P3112<br/>
<input type="checkbox" name="spacegroups[]" id="sg_P3212" value="P3212"> P3212<br/>